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OSCAR, GOERKE, (')Fl BROOKLYN, NEW YORK.

` Leners Patent No. 72,430, dated December 2.4, 1867.

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Be it known that I, Oser-1R GOEKE, of Brooklyn, in the county of Kings, and State of New York, have invented a new and useful. Improvement in Stereoscopes; and I do hereby declare that. the following is a'full,

. clear, and exact description thereof', which will enable others skilled in the art to make and use the sam'e,.refer ence being had to the accompanyingv drawings, forming part of this specification.

Figure 1 is a. horizontal section ofmy improved stereoscope, taken through the line x g. 2. Figure 2 is a vertical section ofthe same, taken'through'the line y y, iig. 1. 4Similar letters of reference indicate corresponding parte. i -My invention has for'its object to simplify and improve the construction of stereoscopes, so as to make them less expensive in construction, and more eiective and convenient in operation; and. it consists in the construction ofthe picture-holders, in the construction of the 'upper cylinder orshaft, and in the combina-tion of parts, by which the bearings for the lower cylinder or shaft are adjusted .to tighten or loosen the endless belt, j 'v ns required, the whole being constructed and arranged as hereinafter more fully described. A is the box, which is made upright, and the top ofwhichfis hinged, s o as to open in the ordinary manner.

The box A is made open at the bottom, so that, should any of thepictures accidentally fall into it, they can be 'k readily removed. B-is an endless belt, which I prefer tonnake of rubber, to which the picture-holders C are attached, andlwhich passes around the shat'tsv lor cylinders D mid E. The picture-.holders C are formed bynttaching the end wires el, the upper ends ofwhich are bent, so as'to form a horizontal loop for the reception of y the endscf-the pictures, andthe central straight wire'or pin c, to the stick or bar c, which is attached to the endless belt or belts B, and which are made much smaller and lighter than can be done when the machine -is constructed in the ordinary manner-, allowing a much largernumber ot' pictures to be inserted than can'usually be done. 'The upper shaft or cylinder D is'made octogonall in4 shape, and much smaller than in the common machines, thus getting rid of the projecting corners or angles of the ordinary shaft, and allowing the pictures to stand closer together than they otherwise could. v The size otthelower shaft E is immaterial, but, by increasing its size, the length ofthe endless belt or belts will be increased, nnd, consequently, the number of pictures that may be used. The journals of the shaft orcylinder E revolve in slots or bearings in the sliding bars F,

-which slide up and down [along the sides of the boxiA, and are kept in place by the flanges or'keepersG,

attached to said sides of the box, and which form grooves to receive the ends of the said bars, H are "cords,

the ends of which are connected to the sliding bars F, near their ends, and which are attached to the set-screws I, so that.; by turning the said screws invone or the other direction, the endless belt or belts B maybe tightened or slackened, as maybe desired. r f

I claim as new, and desire to secure by Letters Patentv 1. The picture-holders '0, constructed as described, consisting of the end wires e', in' the bars c3, their upper ends bent to form a horizontal loop for the ends of the pictures,-and the central pin c, as herein shown and described. -i

2. The construction of the octagoual rollers D E, endless belt B, picture-holders Cysliding bar F, guides G, cord I-Lvand pin I, all arranged and operating as herein described lfor the purpose specified. v 3. The combination of the setor adjusting-screws I, cords H, sliding ba'rsF, and flanges .or keepers G, with each other, and with the shaft or cylinder E and box'A, substantially as herein shown and described, and

for the purpose set forth.

" OSCAR GOERKE.

Witnesses:

WM. F. McNnMAnA, 'JAMESAT. GRAHAM, 

